Q$1.$ Write a C function with the following prototype:

void replaceAtDotWithUnderscores$($char $*$s$1)$

This function replaces ALL $\text{'}$@$\text{'}$ AND $\text{'}.\text{'}$ characters in the string s$1$ with

the underscore character $\text{'}\_\text{'}.$

NOTE: For this function, you must use only pointer notation and pointer arithmetic

$(*)$ and NOT the $[]$ subscript array indexing operator