Build me a Real Time Operating System that can support up to 20 tasks (C programming)

One of the projects required the RTOS to handle the below requirements. • The RTOS kernel can support up to 20 tasks. • The system tick time is 10ms (i.e., SysTick is triggered every 10 ms). • The scheduling decision (i.e., deciding which task to run next) should be decoupled from the context switch (changing the stack pointers). The scheduling decision should be done in function OS_Schd. The context switch should be done in the handler of PendSV. • Each task is associated with a weight value. When the RTOS kernel switches to execute a task, it will execute for w system ticks, where w is the weight value of this task, and the switch to the next task. The order for tasks to execute should be consistent with the order of the creation of the tasks. • Each task is created using function OS_createTask. The function receives several parameters, including the weight value of the task, the stack pointer, the starting address of the stack and the function to be executed in this task. The stack and the stack pointer of the task are initialized in OS_createTask. OS_createTask creates a single task each time, and tasks are all created using OS_createTask. And there are 2 more project need to be done. Feel free to contact me and I can provide you with more information. All the projects should be able to deploy on a MCU - Stellaris LM4F120. You can use IAR IDE to simulate first.