feat: created a file and folder for the stretch assignment, where i implemented the code

Author: brooklynharden

lesson_06/brooklynharden/abbreviation.ts

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+function isValidAlphaAbbreviation(word:string, abbreviation:string):boolean{
+    let i:number = 0; //keep the index of the word
+    for(let j=0; j<abbreviation.length;j++){
+        const abbrChar=abbreviation[j]; 
+
+         // We add 1 to shift the range, 'a'.charCodeAt(0) - 'a'.charCodeAt(0) = 0 ,
+         // because 97-97 = 0. 
+         // Adding the '1' shifts it to a===1, which is what we want.
+        
+        const skip =abbrChar.charCodeAt(0) - 'a'.charCodeAt(0) + 1 ; 
+        if(word[i] === abbrChar){ 
+            i++; //if the current word letter and the current abbrchar match match go to the next letter
+        }else{
+            i+=skip; // Otherwise, treat abbrChar as a letter abbreviation and skip that many characters
+        }
+    }
+    return i === word.length;
+}
+
+console.log(isValidAlphaAbbreviation("substitution", "sjn")); //true
+console.log(isValidAlphaAbbreviation("test", "ab")); //false