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#include "utils/StringUtils.hpp" | 
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 | 
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string UpperCase(const string& S) { | 
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  string uc = S; | 
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  unsigned int n = uc.size(); | 
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  for (unsigned int j = 0; j < n; j++) {    | 
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    char sj = uc[j]; | 
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    if (sj >= 'a' && sj <= 'z') uc[j] = (char)(sj - ('a' - 'A')); | 
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  } | 
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  return uc; | 
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} | 
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 | 
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string LowerCase(const string& S) { | 
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  string lc = S; | 
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  unsigned int n = lc.size(); | 
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  for (unsigned int j = 0; j < n; j++) { | 
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    char sj = lc[j]; | 
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    if (sj >= 'A' && sj <= 'Z') lc[j] = (char)(sj + ('a' - 'A')); | 
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  } | 
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  return lc; | 
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} |