diff --git a/CMakeLists.txt b/CMakeLists.txt
index 321f2de..499bee9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,21 +5,22 @@ set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 
 include_directories(${PROJECT_SOURCE_DIR}/Include)
-file(GLOB_RECURSE SRC_FILES "${PROJECT_SOURCE_DIR}/Src/Hallocy/*.c")
+file(GLOB_RECURSE SRC_FILES "${PROJECT_SOURCE_DIR}/Src/*.c")
 
 add_library(Hallocy STATIC ${SRC_FILES})
-add_executable(HallocyApp ${PROJECT_SOURCE_DIR}/Src/Main.c)
+add_executable(HallocyTest ${PROJECT_SOURCE_DIR}/Tests/Main.c)
 
-target_link_libraries(HallocyApp Hallocy)
+target_include_directories(HallocyTest PRIVATE ${PROJECT_SOURCE_DIR}/Tests)
+target_link_libraries(HallocyTest Hallocy)
 
 if (MSVC)
     target_compile_options(Hallocy PRIVATE /W4 /Zl)
 else()
     target_compile_options(Hallocy PRIVATE -mavx512f -mavx512vl)
-    target_compile_options(HallocyApp PRIVATE -mavx512f -mavx512vl)
+    target_compile_options(HallocyTest PRIVATE -mavx512f -mavx512vl)
     
     target_compile_options(Hallocy PRIVATE -march=native)
-    target_compile_options(HallocyApp PRIVATE -march=native)
+    target_compile_options(HallocyTest PRIVATE -march=native)
 
     target_compile_options(Hallocy PRIVATE -Wall -Wextra -pedantic)
 endif()
\ No newline at end of file
diff --git a/Include/Hallocy/Allocator.h b/Include/Hallocy/Allocator.h
new file mode 100644
index 0000000..a8f0805
--- /dev/null
+++ b/Include/Hallocy/Allocator.h
@@ -0,0 +1,34 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * -----------------------------------------------------------------------------
+ * File: Allocator.h
+ * Description:
+ *  This file contains the functions for allocating, freeing and managing memory.
+ *  It includes functions to allocate, reallocate, free, copy, move and set memory.
+ * 
+ * Author: Mineplay
+ * -----------------------------------------------------------------------------
+ */
+#ifndef HALLOCY_ALLOCATOR
+#define HALLOCY_ALLOCATOR
+
+#include <stddef.h>
+#include <stdbool.h>
+
+#include "Error.h"
+
+void *hallocy_malloc(size_t size);
+HallocyError hallocy_free(void *pointer);
+
+#endif
\ No newline at end of file
diff --git a/Include/Hallocy/Error.h b/Include/Hallocy/Error.h
new file mode 100644
index 0000000..3e65784
--- /dev/null
+++ b/Include/Hallocy/Error.h
@@ -0,0 +1,34 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * -----------------------------------------------------------------------------
+ * File: Error.h
+ * Description:
+ *  This file contains the ErrorCode enum that defines the error codes for the 
+ *  library.
+ * 
+ * Author: Mineplay
+ * -----------------------------------------------------------------------------
+ */
+#ifndef HALLOCY_ERROR
+#define HALLOCY_ERROR
+
+typedef enum {
+    HALLOCY_ERROR_NONE = 0,
+    HALLOCY_ERROR_INVALID_POINTER = 1,
+    HALLOCY_ERROR_OUT_OF_MEMORY = 2,
+    HALLOCY_ERROR_UNKNOWN = 3,
+    HALLOCY_ERROR_INVALID_PARAM = 4
+} HallocyError;
+
+#endif
\ No newline at end of file
diff --git a/Src/Allocator.c b/Src/Allocator.c
new file mode 100644
index 0000000..5471122
--- /dev/null
+++ b/Src/Allocator.c
@@ -0,0 +1,393 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * -----------------------------------------------------------------------------
+ * File: Allocator.h
+ * Description:
+ *  This file implements the functions for allocating, freeing and managing memory.
+ *  It includes functions to allocate, reallocate, free, copy, move and set memory.
+ * 
+ * Author: Mineplay
+ * -----------------------------------------------------------------------------
+ */
+#include "../Include/Hallocy/Allocator.h"
+
+#if defined(_WIN32)
+#include <windows.h>
+
+static const INIT_ONCE HALLOCY_INIT_ONCE = INIT_ONCE_STATIC_INIT;
+
+static HANDLE hallocy_heap = NULL;
+static CRITICAL_SECTION hallocy_critical_section;
+#elif defined(__linux__)
+#include <unistd.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <syscall.h>
+
+static const int HALLOCY_FUTEX_WAKE = 0;
+static const int HALLOCY_FUTEX_WAIT = 1;
+
+static int hallocy_futex_address = 0;
+#endif
+
+typedef struct HallocyMemoryHeader {
+    size_t size;
+    struct HallocyMemoryHeader *next;
+} HallocyMemoryHeader;
+
+static size_t hallocy_medium_memory_freed = 0;
+static size_t hallocy_medium_memory_allocated = 0;
+static HallocyMemoryHeader *hallocy_medium_memory_bin = NULL;
+
+static _Thread_local size_t hallocy_small_memory_freed = 0;
+static _Thread_local size_t hallocy_small_memory_allocated = 0;
+static _Thread_local HallocyMemoryHeader *hallocy_small_memory_bin = NULL;
+
+static size_t page_size = 0;
+static size_t hallocy_small_allocation_size = 0;
+static size_t hallocy_medium_allocation_size = 0;
+
+#if defined(_WIN32)
+static BOOL CALLBACK hallocy_initialize_mutex(PINIT_ONCE init_once, PVOID parameter, PVOID *context) {
+    (void)init_once;
+    (void)parameter;
+    (void)context;
+
+    return InitializeCriticalSectionEx(&hallocy_critical_section, 0x00000400, 0);
+}
+#endif
+
+void *hallocy_malloc(size_t size) {
+    if (page_size == 0) {
+        #if defined(_WIN32)
+        SYSTEM_INFO system_info;
+        GetSystemInfo(&system_info);
+
+        page_size = system_info.dwPageSize;
+        #elif defined(__linux__)
+        page_size = sysconf(_SC_PAGE_SIZE);
+        #endif
+
+        hallocy_small_allocation_size = page_size;
+        hallocy_medium_allocation_size = page_size * 10;
+    }
+
+    size_t aligned_size = page_size * (((size + sizeof(HallocyMemoryHeader)) / page_size) + 1);
+    HallocyMemoryHeader *memory_pointer = NULL;
+    if (aligned_size <= hallocy_small_allocation_size) {
+        HallocyMemoryHeader *previous_header = NULL;
+        memory_pointer = hallocy_small_memory_bin;
+        while (memory_pointer != NULL) {
+            if (memory_pointer->size >= aligned_size) {
+                hallocy_small_memory_allocated += memory_pointer->size;
+                hallocy_small_memory_freed -= memory_pointer->size;
+
+                if (previous_header == NULL) {
+                    hallocy_small_memory_bin = hallocy_small_memory_bin->next; 
+                } else {
+                    previous_header->next = memory_pointer->next;
+                }
+
+                memory_pointer->next = NULL;
+                return (void*)(memory_pointer + 1);
+            }
+
+            previous_header = memory_pointer;
+            memory_pointer = memory_pointer->next;
+        }
+
+        #if defined(_WIN32)
+        if (hallocy_heap == NULL) {
+            hallocy_heap = GetProcessHeap();
+        }
+
+        memory_pointer = HeapAlloc(hallocy_heap, 0, aligned_size);
+        if (memory_pointer == NULL) {
+            return NULL;
+        }
+        #elif defined(__linux__)
+        memory_pointer = mmap(NULL, aligned_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+        if (memory_pointer == MAP_FAILED) {
+            return NULL;
+        }
+        #endif
+
+        hallocy_small_memory_allocated += aligned_size;
+    } else if (aligned_size <= hallocy_medium_allocation_size) { 
+        #if defined(_WIN32)
+        InitOnceExecuteOnce(&HALLOCY_INIT_ONCE, hallocy_initialize_mutex, NULL, NULL);
+        EnterCriticalSection(&hallocy_critical_section);
+        #elif defined(__linux__)
+        bool locked = false;
+        while (!locked) {
+            if (__sync_bool_compare_and_swap(&hallocy_futex_address, 0, 1)) {
+                locked = true;
+            } else {
+                syscall(SYS_futex, &hallocy_futex_address, HALLOCY_FUTEX_WAIT, 1, NULL, NULL, 0);
+            }
+        }
+        #endif
+
+        HallocyMemoryHeader *previous_header = NULL;
+        memory_pointer = hallocy_medium_memory_bin;
+        while (memory_pointer != NULL) {
+            if (memory_pointer->size >= aligned_size) {
+                hallocy_medium_memory_allocated += memory_pointer->size;
+                hallocy_medium_memory_freed -= memory_pointer->size;
+
+                if (previous_header == NULL) {
+                    hallocy_medium_memory_bin = hallocy_medium_memory_bin->next; 
+                } else {
+                    previous_header->next = memory_pointer->next;
+                }
+
+                #if defined(_WIN32)
+                LeaveCriticalSection(&hallocy_critical_section);
+                #elif defined(__linux__)
+                hallocy_futex_address = 0;
+                syscall(SYS_futex, &hallocy_futex_address, HALLOCY_FUTEX_WAKE, 1, NULL, NULL, 0);
+                #endif
+
+                memory_pointer->next = NULL;
+                return (void*)(memory_pointer + 1);
+            }
+
+            previous_header = memory_pointer;
+            memory_pointer = memory_pointer->next;
+        }
+
+        #if defined(_WIN32)
+        if (hallocy_heap == NULL) {
+            hallocy_heap = GetProcessHeap();
+        }
+
+        memory_pointer = HeapAlloc(hallocy_heap, 0, aligned_size);
+        if (memory_pointer == NULL) {
+            return NULL;
+        }
+
+        hallocy_medium_allocation_size += aligned_size;
+        LeaveCriticalSection(&hallocy_critical_section);
+        #elif defined(__linux__)
+        memory_pointer = mmap(NULL, aligned_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+        if (memory_pointer == MAP_FAILED) {
+            return NULL;
+        }
+
+        hallocy_medium_allocation_size += aligned_size;
+
+        hallocy_futex_address = 0;
+        syscall(SYS_futex, &hallocy_futex_address, HALLOCY_FUTEX_WAKE, 1, NULL, NULL, 0);
+        #endif
+    } else {
+        #if defined(_WIN32)
+        memory_pointer = (HallocyMemoryHeader*)VirtualAlloc(NULL, aligned_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+        if (memory_pointer == NULL) {
+            return NULL;
+        }
+        #elif defined(__linux__)
+        memory_pointer = (HallocyMemoryHeader*)mmap(NULL, aligned_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+        if (memory_pointer == MAP_FAILED) {
+            return NULL;
+        }
+        #endif
+    }
+
+    memory_pointer->size = aligned_size;
+    memory_pointer->next = NULL;
+
+    return (void*)(memory_pointer + 1);
+}
+
+HallocyError hallocy_free(void *pointer) {
+    if (pointer == NULL) {
+        return HALLOCY_ERROR_INVALID_POINTER;
+    }
+
+    HallocyMemoryHeader *memory_header = ((HallocyMemoryHeader*)pointer) - 1;
+    if (memory_header->size <= hallocy_small_allocation_size) {
+        memory_header->next = hallocy_small_memory_bin;
+        hallocy_small_memory_bin = memory_header;
+        
+        hallocy_small_memory_allocated -= memory_header->size;
+        hallocy_small_memory_freed += memory_header->size;
+        if (hallocy_small_memory_allocated == 0 && hallocy_small_memory_freed > hallocy_medium_allocation_size) {
+            HallocyMemoryHeader *previous_header = NULL;
+            HallocyMemoryHeader *current_header = hallocy_small_memory_bin;
+            while (current_header != NULL) {
+                previous_header = current_header;
+                current_header = current_header->next;
+
+                #if defined(_WIN32)
+                bool result = HeapFree(hallocy_heap, 0, previous_header);
+                if (result == false) {
+                    DWORD error = GetLastError();
+                    switch (error) {
+                        case ERROR_INVALID_PARAMETER:
+                            return HALLOCY_ERROR_INVALID_PARAM;
+        
+                        case ERROR_NOT_ENOUGH_MEMORY:
+                            return HALLOCY_ERROR_OUT_OF_MEMORY;
+        
+                        case ERROR_INVALID_HANDLE:
+                            return HALLOCY_ERROR_INVALID_POINTER;
+        
+                        default:
+                            return HALLOCY_ERROR_UNKNOWN;
+                    }
+                }
+                #elif defined(__linux__)
+                int result = munmap(previous_header, previous_header->size);
+                if (result == -1) {
+                    switch (errno) {
+                        case EINVAL:
+                            return HALLOCY_ERROR_INVALID_PARAM;
+        
+                        case ENOMEM:
+                            return HALLOCY_ERROR_OUT_OF_MEMORY;
+        
+                        case EFAULT:
+                            return HALLOCY_ERROR_INVALID_POINTER;
+        
+                        default:
+                            return HALLOCY_ERROR_UNKNOWN;
+                    }
+                }
+                #endif
+            }
+
+            hallocy_small_memory_bin = NULL;
+            hallocy_small_memory_allocated = 0;
+            hallocy_small_memory_freed = 0;
+        }
+    } else if (memory_header->size <= hallocy_medium_allocation_size) {
+        #if defined(_WIN32)
+        InitOnceExecuteOnce(&HALLOCY_INIT_ONCE, hallocy_initialize_mutex, NULL, NULL);
+        EnterCriticalSection(&hallocy_critical_section);
+        #elif defined(__linux__)
+        bool locked = false;
+        while (!locked) {
+            if (__sync_bool_compare_and_swap(&hallocy_futex_address, 0, 1)) {
+                locked = true;
+            } else {
+                syscall(SYS_futex, &hallocy_futex_address, HALLOCY_FUTEX_WAIT, 1, NULL, NULL, 0);
+            }
+        }
+        #endif
+
+        memory_header->next = hallocy_medium_memory_bin;
+        hallocy_medium_memory_bin = memory_header;
+        
+        hallocy_medium_memory_allocated -= memory_header->size;
+        hallocy_medium_memory_freed += memory_header->size;
+        if (hallocy_medium_memory_allocated == 0 && hallocy_medium_memory_freed > hallocy_medium_allocation_size) {
+            HallocyMemoryHeader *previous_header = NULL;
+            HallocyMemoryHeader *current_header = hallocy_medium_memory_bin;
+            while (current_header != NULL) {
+                previous_header = current_header;
+                current_header = current_header->next;
+
+                #if defined(_WIN32)
+                bool result = HeapFree(hallocy_heap, 0, previous_header);
+                if (result == false) {
+                    DWORD error = GetLastError();
+                    switch (error) {
+                        case ERROR_INVALID_PARAMETER:
+                            return HALLOCY_ERROR_INVALID_PARAM;
+        
+                        case ERROR_NOT_ENOUGH_MEMORY:
+                            return HALLOCY_ERROR_OUT_OF_MEMORY;
+        
+                        case ERROR_INVALID_HANDLE:
+                            return HALLOCY_ERROR_INVALID_POINTER;
+        
+                        default:
+                            return HALLOCY_ERROR_UNKNOWN;
+                    }
+                }
+                #elif defined(__linux__)
+                int result = munmap(previous_header, previous_header->size);
+                if (result == -1) {
+                    switch (errno) {
+                        case EINVAL:
+                            return HALLOCY_ERROR_INVALID_PARAM;
+        
+                        case ENOMEM:
+                            return HALLOCY_ERROR_OUT_OF_MEMORY;
+        
+                        case EFAULT:
+                            return HALLOCY_ERROR_INVALID_POINTER;
+        
+                        default:
+                            return HALLOCY_ERROR_UNKNOWN;
+                    }
+                }
+                #endif
+            }
+
+            hallocy_medium_memory_bin = NULL;
+            hallocy_medium_memory_allocated = 0;
+            hallocy_medium_memory_freed = 0;
+        }
+
+        #if defined(_WIN32)
+        LeaveCriticalSection(&hallocy_critical_section);
+        #elif defined(__linux__)
+        hallocy_futex_address = 0;
+        syscall(SYS_futex, &hallocy_futex_address, HALLOCY_FUTEX_WAKE, 1, NULL, NULL, 0);
+        #endif
+    } else {
+        #if defined(_WIN32)
+        bool result = VirtualFree(memory_header, 0, MEM_RELEASE);
+        if (result == false) {
+            DWORD error = GetLastError();
+            switch (error) {
+                case ERROR_INVALID_PARAMETER:
+                    return HALLOCY_ERROR_INVALID_PARAM;
+
+                case ERROR_NOT_ENOUGH_MEMORY:
+                    return HALLOCY_ERROR_OUT_OF_MEMORY;
+
+                case ERROR_INVALID_HANDLE:
+                    return HALLOCY_ERROR_INVALID_POINTER;
+
+                case ERROR_INVALID_ADDRESS:
+                    return HALLOCY_ERROR_INVALID_POINTER;
+
+                default:
+                    return HALLOCY_ERROR_UNKNOWN;
+            }
+        }
+        #elif defined(__linux__)
+        int result = munmap(memory_header, memory_header->size);
+        if (result == -1) {
+            switch (errno) {
+                case EINVAL:
+                    return HALLOCY_ERROR_INVALID_PARAM;
+
+                case ENOMEM:
+                    return HALLOCY_ERROR_OUT_OF_MEMORY;
+
+                case EFAULT:
+                    return HALLOCY_ERROR_INVALID_POINTER;
+
+                default:
+                    return HALLOCY_ERROR_UNKNOWN;
+            }
+        }
+        #endif
+    }
+
+    return HALLOCY_ERROR_NONE;
+}
\ No newline at end of file
diff --git a/Src/Main.c b/Src/Main.c
deleted file mode 100644
index 8321e25..0000000
--- a/Src/Main.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <stdio.h>
-
-int main() {
-    printf("Hello, World!\n");
-    return 0;
-}
\ No newline at end of file
diff --git a/Tests/Main.c b/Tests/Main.c
new file mode 100644
index 0000000..3b13990
--- /dev/null
+++ b/Tests/Main.c
@@ -0,0 +1,44 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * -----------------------------------------------------------------------------
+ * File: Main.c
+ * Description:
+ *  Executes all tests.
+ * 
+ * Author: Mineplay
+ * -----------------------------------------------------------------------------
+ */
+ #include <stdio.h>
+ #include <Hallocy/Allocator.h>
+ 
+ int main() {
+     char *memory = (char *)hallocy_malloc(12288);
+     if (memory == NULL) {
+         printf("Failed it allocate memory!");
+         return -1;
+     }
+ 
+     memory[0] = 'H';
+     memory[1] = 'i';
+     memory[2] = '\0';
+ 
+     printf("%s\n", memory);
+     int code = hallocy_free(memory);
+     if (code != HALLOCY_ERROR_NONE) {
+         printf("Failed to free memory error code (%d)!", code);
+         return -1;
+     }
+ 
+     return 0;
+ }
\ No newline at end of file