Can you please solve this code problem and explain how with steps?

Write a function whose prototype is given by

string replaceDigits$($string s$)$;

The function replaces each digit character of $s$ with $\text{'}$#$\text{'}$; all other characters are left unchanged. The

transformed string is returned to the calling function.

A sample main function for testing your function is shown in Figure $1.$ Commands to compile, link,

and run this assignment are shown in Figure $2.$ To use the Makefile as distributed in class, add a target of

lab$48$ to targets$2$srcfiles.

Figure $1./$usr$/$local$/1337/$src$/$lab$48$main.C

Figure $2.$ Commands to Compile, Link, & Run Lab $48?$