Compare Strings (C-convention)

This function compares two strings using C-convention.

This (old) function compares two strings and gives an output similar to the C-function strcmp.
Unlike the MATLAB strcmp function the strings are compared in the alphabetical order.

c=strcmp(s1,s2)

c : -1 if s1<s2, 0 if s1==s2, +1 if s1>s2.

(This is an old function, which I wanted to supply now....)