Kindly provide the C code with comments and code is required for around $[3-4$ marks$].$

Write the code of a documented $C$ function called

"fir", which has four input parameters: a pointer to a

buffer of FIR filter coefficients "coeffs"; the length $"N"$

of the buffer "coeffs"; a pointer to a buffer of previous

input samples $"$tdl$"$ of length $N$; a new sample $"s"$ to

be stored in $"$tdl$".$ This function performs FIR filtering

and it returns the current output of the FIR filter, for

the current input $"$s$".$

In your code, use samples of type "float". You can

ignore possible overflow and underflow issues. No

static variables are required. The order of the

elements in $"$tdl$"$ can be changed. The comments in

the $C$ code should describe rationale behind the

proposed implementation.