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deleted 4 characters in body; added 34 characters in body
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mdahmoune
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D, 351351 345 bytes

-6 bytes thanx to KevinCruijssen

string f(string a,string b){import std.algorithm;string x,y,z;size_t i,j,k;foreach(c;levenshteinDistanceAndPath(a,b)[1]){final switch(c)with(EditOp){case none:x~=a[i++];y~=b[j++];z~=" ";break;case substitute:x~=a[i++];y~=b[j++];z~="M";break;case insert:x~=" ";y~=b[j++];z~="A";break;case remove:x~=a[i++];y~=" ";z~="R";break;";z~="R";}}return x~"\n"~y~"\n"~z;} 

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D, 351 bytes

string f(string a,string b){import std.algorithm;string x,y,z;size_t i,j,k;foreach(c;levenshteinDistanceAndPath(a,b)[1]){final switch(c)with(EditOp){case none:x~=a[i++];y~=b[j++];z~=" ";break;case substitute:x~=a[i++];y~=b[j++];z~="M";break;case insert:x~=" ";y~=b[j++];z~="A";break;case remove:x~=a[i++];y~=" ";z~="R";break;}}return x~"\n"~y~"\n"~z;} 

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D, 351 345 bytes

-6 bytes thanx to KevinCruijssen

string f(string a,string b){import std.algorithm;string x,y,z;size_t i,j,k;foreach(c;levenshteinDistanceAndPath(a,b)[1]){final switch(c)with(EditOp){case none:x~=a[i++];y~=b[j++];z~=" ";break;case substitute:x~=a[i++];y~=b[j++];z~="M";break;case insert:x~=" ";y~=b[j++];z~="A";break;case remove:x~=a[i++];y~=" ";z~="R";}}return x~"\n"~y~"\n"~z;} 

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Source Link
mdahmoune
  • 3.1k
  • 2
  • 16
  • 28

D, 351 bytes

string f(string a,string b){import std.algorithm;string x,y,z;size_t i,j,k;foreach(c;levenshteinDistanceAndPath(a,b)[1]){final switch(c)with(EditOp){case none:x~=a[i++];y~=b[j++];z~=" ";break;case substitute:x~=a[i++];y~=b[j++];z~="M";break;case insert:x~=" ";y~=b[j++];z~="A";break;case remove:x~=a[i++];y~=" ";z~="R";break;}}return x~"\n"~y~"\n"~z;} 

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