EXCEL - 텍스트 함수

1. MID - https://support.microsoft.com/ko-kr/office/mid-midb-%ED%95%A8%EC%88%98-d5f9e25c-d7d6-472e-b568-4ecb12433028

2. LEFT - https://support.microsoft.com/ko-kr/office/left-leftb-%ED%95%A8%EC%88%98-9203d2d2-7960-479b-84c6-1ea52b99640c

3. RIGHT - https://support.microsoft.com/ko-kr/office/right-rightb-%ED%95%A8%EC%88%98-240267ee-9afa-4639-a02b-f19e1786cf2f

4. PROPER - https://support.microsoft.com/ko-kr/office/proper-%ED%95%A8%EC%88%98-52a5a283-e8b2-49be-8506-b2887b889f94

5. UPPER - https://support.microsoft.com/ko-kr/office/upper-%ED%95%A8%EC%88%98-c11f29b3-d1a3-4537-8df6-04d0049963d6

6. LOWER - https://support.microsoft.com/ko-kr/office/lower-%ED%95%A8%EC%88%98-3f21df02-a80c-44b2-afaf-81358f9fdeb4

7. TRIM - https://support.microsoft.com/ko-kr/office/trim-%ED%95%A8%EC%88%98-410388fa-c5df-49c6-b16c-9e5630b479f9

8. LEN - https://support.microsoft.com/ko-kr/office/len-lenb-%ED%95%A8%EC%88%98-29236f94-cedc-429d-affd-b5e33d2c67cb