Replacing a string inside a txt line by line

How would i check for the strings below **line by line in a txt** and replace each one? "FLD_CUSTORDREF_FLD" "FLD_CUSTOMERNAME_FLD" "FLD_ADDRESSLINE1_FLD" "FLD_ADDRESSLINE2_FLD" "FLD_CITY_FLD" e.g. If file line has "FLD_CITY_FLD" change to Header->City else if file line has "FLD_CUSTOMERNAME_FLD" change to Header->Name I can read each line by using while ( fgets ( line, sizeof line, file ) != NULL ) But how would i check for a matching string?
Does it have to be with C? Using Perl, Awk, Ruby, Python, etc. would be much simpler.

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