translate function

good day!

how could i use the function translate to output the replacement of the
exact occurrence of the 2nd parameter?

for instance,
    select translate('Juan dela Cruz C/O ABC Co.','C/O','c/o');
gives
             translate
    ----------------------------
     Juan dela cruz c/o ABc co.

i would like the output to be "Juan dela Cruz c/o ABC Co." instead of "Juan
dela cruz c/o ABc co." could i do this with the above function, or are
there any functions that could do this?

thank you very much!