acronym: remove proof from stub file

exercises/practice/acronym/src/acronym.cob

@@ -1,50 +1,11 @@
        IDENTIFICATION DIVISION.
        PROGRAM-ID. acronym.
-       AUTHOR. kapitaali.
        ENVIRONMENT DIVISION.
        DATA DIVISION.
-       FILE SECTION.
 
        WORKING-STORAGE SECTION.
        01 WS-ACRONYM               PIC X(80).
        01 WS-RESULT                PIC X(20).
-       01 LEN                      PIC 99.
-       01 PICKNEXT                 PIC 9.
-       01 COUNTER                  PIC 99.
-       01 IDX                      PIC 99.
-       01 CHAR                     PIC X.
 
        PROCEDURE DIVISION.
        ABBREVIATE.
-           PERFORM STR-LENGTH.    
-           MOVE 1 TO IDX.
-           MOVE SPACES TO WS-RESULT.
-           MOVE 1 TO PICKNEXT.      
-           PERFORM VARYING COUNTER FROM 1 BY 1 UNTIL COUNTER = LEN 
-               MOVE WS-ACRONYM(COUNTER:1) TO CHAR
-               EVALUATE CHAR
-               WHEN "_"
-                   CONTINUE
-               WHEN SPACE
-                   MOVE 1 TO PICKNEXT
-                   CONTINUE
-               WHEN "-"
-                   MOVE 1 TO PICKNEXT
-                   CONTINUE
-               WHEN OTHER
-                   IF PICKNEXT = 1
-                       MOVE FUNCTION UPPER-CASE(CHAR) 
-                            TO WS-RESULT(IDX:1)
-                       ADD 1 TO IDX
-                   END-IF
-                   MOVE 0 TO PICKNEXT
-           END-PERFORM.
-
-       STR-LENGTH.
-           MOVE 0 TO LEN.
-           MOVE FUNCTION LENGTH(WS-ACRONYM) TO IDX.
-           PERFORM VARYING IDX FROM FUNCTION LENGTH(WS-ACRONYM)
-                   BY -1 UNTIL WS-ACRONYM(IDX:1) <> " "
-               ADD 1 TO LEN
-           END-PERFORM.
-           COMPUTE LEN = 80 - LEN.